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Experimental study on sewage collection and related performance of square arc angle aquaculture tank

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Abstract

The key to efficient operation of RAS is maintaining good water quality in the aquaculture tank. To improve the hydrodynamics and self-cleaning property in the tank, a reduced physical experimental model was constructed according to the geometric scale of 1:8 of the actual square arc angle aquaculture tank in RAS. The influence of the variation of different parameters including inlet layout mode, inflow angle (α), and diameter to depth ratio (L/H) on the hydrodynamics and sewage collection characteristics was systematically evaluated and analyzed through physical model experiments. The results indicate that the velocity distribution influences greatly the distribution and discharge efficiency of sewage and the sewage sedimentation area highly overlaps with the low-velocity area in the tank. The inlet layout mode of single inlet set at arc wall and inflow angle of 45° which are the preferred design parameters improve significantly the velocity distribution and sewage discharge efficiency in the tank. In addition, the discharge efficiency of solid particles in the aquaculture tank increases with the decrease of the diameter to depth ratio. When L/H = 2:1 ~ 3:1, the sewage discharge effect is the best; when L/H = 3.5:1 ~ 4.5:1, the sewage discharge effect is relatively good; when L/H = 5:1 ~ 7:1, the sewage discharge effect is greatly weakened. The present study provides a basis for further improving the design of the inlet mode, inflow angle, and diameter to depth ratio of aquaculture tanks.

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Acknowledgements

The authors would like to thank the Key Laboratory of Environment Controlled Aquaculture Ministry of Education and Dalian Ocean University.

Funding

This work is supported by 2023 Central Government Finance Subsidy Project for Liaoning Fisheries, the National Natural Science Foundation of China (approval no. 31872609), the Innovation Support Program for High-level Talents of Dalian City (2019RD12), and the earmarked fund for CARS-49.

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Author notes

  1. Zonglong Che and Yinxin Zhou contributed equally to this work.

Authors and Affiliations

  1. College of Ocean and Civil Engineering, Dalian Ocean University, Dalian, 116023, China

    Zonglong Che, Chenxu Zhao, Wei Sun, Haibo Liu & Meng Li

  2. Key Laboratory of Environment Controlled Aquaculture (Dalian Ocean University) Ministry of Education, Dalian, 116023, China

    Zonglong Che, Yinxin Zhou, Chenxu Zhao, Xiaozhong Ren, Wei Sun, Haibo Liu & Meng Li

  3. College of Marine Science and Environment, Dalian Ocean University, Dalian, 116023, China

    Yinxin Zhou

  4. College of Biosystems Engineering and Food Science (BEFS), Zhejiang University, Hangzhou, 310058, China

    Hangfei Liu

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  1. Zonglong Che
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  4. Xiaozhong Ren
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Contributions

ZC, XR, and HL contributed to the study conception and design. Material preparation, data collection, and analysis were performed by ZC, YZ, CZ, WS, HL, and ML. The first draft of the manuscript was written by ZC, and it was revised by YZ. All authors commented on the previous versions of the manuscript.

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Correspondence to Xiaozhong Ren or Hangfei Liu.

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Che, Z., Zhou, Y., Zhao, C. et al. Experimental study on sewage collection and related performance of square arc angle aquaculture tank. Aquacult Int 32, 3017–3040 (2024). https://doi.org/10.1007/s10499-023-01309-y

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